Microwave oven



FIG. 1 is a front elevational view of a microwave oven, showing our new design;

FIG. 2 is a bottom plan view thereof;

FIG. 3 is a side elevational view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a rear elevational view thereof.

The side of the oven which is not shown is a mirror image of the side disclosed in FIG. 3. 

The ornamental design for a microwave oven, as shown and described. 